First bioinsecticide to be developed on commercial scale was

Quinine

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DDT

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Organophosphate

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Sporeine

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Solution

The correct option is D Sporeine
Sporeine is the commercial product made from Bt. The active ingredient in Bt is a toxic protein whose crystals get binds to specific sites on the midgut of harmful insects. This protein cause lysis. The advantage of sporeine is that it only harms the harmful insects. It is widely used in agriculture.
So, the correct option is 'Sporeine'.

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